gcc/tree-streamer-in.c

   1 /* Routines for reading trees from a file stream.
   2
   3    Copyright (C) 2011-2013 Free Software Foundation, Inc.
   4    Contributed by Diego Novillo <dnovillo@google.com>
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "diagnostic.h"
  26 #include "tree.h"
  27 #include "gimple.h"
  28 #include "tree-streamer.h"
  29 #include "data-streamer.h"
  30 #include "streamer-hooks.h"
  31 #include "lto-streamer.h"
  32
  33 /* Read a STRING_CST from the string table in DATA_IN using input
  34    block IB.  */
  35
  36 tree
  37 streamer_read_string_cst (struct data_in *data_in, struct lto_input_block *ib)
  38 {
  39   unsigned int len;
  40   const char * ptr;
  41
  42   ptr = streamer_read_indexed_string (data_in, ib, &len);
  43   if (!ptr)
  44     return NULL;
  45   return build_string (len, ptr);
  46 }
  47
  48
  49 /* Read an IDENTIFIER from the string table in DATA_IN using input
  50    block IB.  */
  51
  52 static tree
  53 input_identifier (struct data_in *data_in, struct lto_input_block *ib)
  54 {
  55   unsigned int len;
  56   const char *ptr;
  57
  58   ptr = streamer_read_indexed_string (data_in, ib, &len);
  59   if (!ptr)
  60     return NULL;
  61   return get_identifier_with_length (ptr, len);
  62 }
  63
  64
  65 /* Read a chain of tree nodes from input block IB. DATA_IN contains
  66    tables and descriptors for the file being read.  */
  67
  68 tree
  69 streamer_read_chain (struct lto_input_block *ib, struct data_in *data_in)
  70 {
  71   tree first, prev, curr;
  72
  73   /* The chain is written as NULL terminated list of trees.  */
  74   first = prev = NULL_TREE;
  75   do
  76     {
  77       curr = stream_read_tree (ib, data_in);
  78       if (prev)
  79         TREE_CHAIN (prev) = curr;
  80       else
  81         first = curr;
  82
  83       prev = curr;
  84     }
  85   while (curr);
  86
  87   return first;
  88 }
  89
  90
  91 /* Unpack all the non-pointer fields of the TS_BASE structure of
  92    expression EXPR from bitpack BP.  */
  93
  94 static void
  95 unpack_ts_base_value_fields (struct bitpack_d *bp, tree expr)
  96 {
  97   /* Note that the code for EXPR has already been unpacked to create EXPR in
  98      streamer_alloc_tree.  */
  99   if (!TYPE_P (expr))
 100     {
 101       TREE_SIDE_EFFECTS (expr) = (unsigned) bp_unpack_value (bp, 1);
 102       TREE_CONSTANT (expr) = (unsigned) bp_unpack_value (bp, 1);
 103       TREE_READONLY (expr) = (unsigned) bp_unpack_value (bp, 1);
 104
 105       /* TREE_PUBLIC is used on types to indicate that the type
 106          has a TYPE_CACHED_VALUES vector.  This is not streamed out,
 107          so we skip it here.  */
 108       TREE_PUBLIC (expr) = (unsigned) bp_unpack_value (bp, 1);
 109     }
 110   else
 111     bp_unpack_value (bp, 4);
 112   TREE_ADDRESSABLE (expr) = (unsigned) bp_unpack_value (bp, 1);
 113   TREE_THIS_VOLATILE (expr) = (unsigned) bp_unpack_value (bp, 1);
 114   if (DECL_P (expr))
 115     DECL_UNSIGNED (expr) = (unsigned) bp_unpack_value (bp, 1);
 116   else if (TYPE_P (expr))
 117     TYPE_UNSIGNED (expr) = (unsigned) bp_unpack_value (bp, 1);
 118   else
 119     bp_unpack_value (bp, 1);
 120   TREE_ASM_WRITTEN (expr) = (unsigned) bp_unpack_value (bp, 1);
 121   if (TYPE_P (expr))
 122     TYPE_ARTIFICIAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 123   else
 124     TREE_NO_WARNING (expr) = (unsigned) bp_unpack_value (bp, 1);
 125   TREE_NOTHROW (expr) = (unsigned) bp_unpack_value (bp, 1);
 126   TREE_STATIC (expr) = (unsigned) bp_unpack_value (bp, 1);
 127   if (TREE_CODE (expr) != TREE_BINFO)
 128     TREE_PRIVATE (expr) = (unsigned) bp_unpack_value (bp, 1);
 129   TREE_PROTECTED (expr) = (unsigned) bp_unpack_value (bp, 1);
 130   TREE_DEPRECATED (expr) = (unsigned) bp_unpack_value (bp, 1);
 131   if (TYPE_P (expr))
 132     {
 133       TYPE_SATURATING (expr) = (unsigned) bp_unpack_value (bp, 1);
 134       TYPE_ADDR_SPACE (expr) = (unsigned) bp_unpack_value (bp, 8);
 135     }
 136   else if (TREE_CODE (expr) == SSA_NAME)
 137     SSA_NAME_IS_DEFAULT_DEF (expr) = (unsigned) bp_unpack_value (bp, 1);
 138   else
 139     bp_unpack_value (bp, 1);
 140 }
 141
 142
 143 /* Unpack all the non-pointer fields of the TS_INT_CST structure of
 144    expression EXPR from bitpack BP.  */
 145
 146 static void
 147 unpack_ts_int_cst_value_fields (struct bitpack_d *bp, tree expr)
 148 {
 149   TREE_INT_CST_LOW (expr) = bp_unpack_var_len_unsigned (bp);
 150   TREE_INT_CST_HIGH (expr) = bp_unpack_var_len_int (bp);
 151 }
 152
 153
 154 /* Unpack all the non-pointer fields of the TS_REAL_CST structure of
 155    expression EXPR from bitpack BP.  */
 156
 157 static void
 158 unpack_ts_real_cst_value_fields (struct bitpack_d *bp, tree expr)
 159 {
 160   unsigned i;
 161   REAL_VALUE_TYPE r;
 162   REAL_VALUE_TYPE *rp;
 163
 164   r.cl = (unsigned) bp_unpack_value (bp, 2);
 165   r.decimal = (unsigned) bp_unpack_value (bp, 1);
 166   r.sign = (unsigned) bp_unpack_value (bp, 1);
 167   r.signalling = (unsigned) bp_unpack_value (bp, 1);
 168   r.canonical = (unsigned) bp_unpack_value (bp, 1);
 169   r.uexp = (unsigned) bp_unpack_value (bp, EXP_BITS);
 170   for (i = 0; i < SIGSZ; i++)
 171     r.sig[i] = (unsigned long) bp_unpack_value (bp, HOST_BITS_PER_LONG);
 172
 173   rp = ggc_alloc_real_value ();
 174   memcpy (rp, &r, sizeof (REAL_VALUE_TYPE));
 175   TREE_REAL_CST_PTR (expr) = rp;
 176 }
 177
 178
 179 /* Unpack all the non-pointer fields of the TS_FIXED_CST structure of
 180    expression EXPR from bitpack BP.  */
 181
 182 static void
 183 unpack_ts_fixed_cst_value_fields (struct bitpack_d *bp, tree expr)
 184 {
 185   FIXED_VALUE_TYPE *fp = ggc_alloc_fixed_value ();
 186   fp->mode = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 187   fp->data.low = bp_unpack_var_len_int (bp);
 188   fp->data.high = bp_unpack_var_len_int (bp);
 189   TREE_FIXED_CST_PTR (expr) = fp;
 190 }
 191
 192 /* Unpack all the non-pointer fields of the TS_DECL_COMMON structure
 193    of expression EXPR from bitpack BP.  */
 194
 195 static void
 196 unpack_ts_decl_common_value_fields (struct bitpack_d *bp, tree expr)
 197 {
 198   DECL_MODE (expr) = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 199   DECL_NONLOCAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 200   DECL_VIRTUAL_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 201   DECL_IGNORED_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 202   DECL_ABSTRACT (expr) = (unsigned) bp_unpack_value (bp, 1);
 203   DECL_ARTIFICIAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 204   DECL_USER_ALIGN (expr) = (unsigned) bp_unpack_value (bp, 1);
 205   DECL_PRESERVE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 206   DECL_EXTERNAL (expr) = (unsigned) bp_unpack_value (bp, 1);
 207   DECL_GIMPLE_REG_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 208   DECL_ALIGN (expr) = (unsigned) bp_unpack_var_len_unsigned (bp);
 209
 210   if (TREE_CODE (expr) == LABEL_DECL)
 211     {
 212       EH_LANDING_PAD_NR (expr) = (int) bp_unpack_var_len_unsigned (bp);
 213
 214       /* Always assume an initial value of -1 for LABEL_DECL_UID to
 215          force gimple_set_bb to recreate label_to_block_map.  */
 216       LABEL_DECL_UID (expr) = -1;
 217     }
 218
 219   if (TREE_CODE (expr) == FIELD_DECL)
 220     {
 221       DECL_PACKED (expr) = (unsigned) bp_unpack_value (bp, 1);
 222       DECL_NONADDRESSABLE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 223       expr->decl_common.off_align = bp_unpack_value (bp, 8);
 224     }
 225
 226   if (TREE_CODE (expr) == VAR_DECL)
 227     {
 228       DECL_HAS_DEBUG_EXPR_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 229       DECL_NONLOCAL_FRAME (expr) = (unsigned) bp_unpack_value (bp, 1);
 230     }
 231
 232   if (TREE_CODE (expr) == RESULT_DECL
 233       || TREE_CODE (expr) == PARM_DECL
 234       || TREE_CODE (expr) == VAR_DECL)
 235     {
 236       DECL_BY_REFERENCE (expr) = (unsigned) bp_unpack_value (bp, 1);
 237       if (TREE_CODE (expr) == VAR_DECL
 238           || TREE_CODE (expr) == PARM_DECL)
 239         DECL_HAS_VALUE_EXPR_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 240     }
 241 }
 242
 243
 244 /* Unpack all the non-pointer fields of the TS_DECL_WRTL structure
 245    of expression EXPR from bitpack BP.  */
 246
 247 static void
 248 unpack_ts_decl_wrtl_value_fields (struct bitpack_d *bp, tree expr)
 249 {
 250   DECL_REGISTER (expr) = (unsigned) bp_unpack_value (bp, 1);
 251 }
 252
 253
 254 /* Unpack all the non-pointer fields of the TS_DECL_WITH_VIS structure
 255    of expression EXPR from bitpack BP.  */
 256
 257 static void
 258 unpack_ts_decl_with_vis_value_fields (struct bitpack_d *bp, tree expr)
 259 {
 260   DECL_COMMON (expr) = (unsigned) bp_unpack_value (bp, 1);
 261   DECL_DLLIMPORT_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 262   DECL_WEAK (expr) = (unsigned) bp_unpack_value (bp, 1);
 263   DECL_SEEN_IN_BIND_EXPR_P (expr) = (unsigned) bp_unpack_value (bp,  1);
 264   DECL_COMDAT (expr) = (unsigned) bp_unpack_value (bp,  1);
 265   DECL_VISIBILITY (expr) = (enum symbol_visibility) bp_unpack_value (bp,  2);
 266   DECL_VISIBILITY_SPECIFIED (expr) = (unsigned) bp_unpack_value (bp,  1);
 267
 268   if (TREE_CODE (expr) == VAR_DECL)
 269     {
 270       DECL_HARD_REGISTER (expr) = (unsigned) bp_unpack_value (bp, 1);
 271       DECL_IN_CONSTANT_POOL (expr) = (unsigned) bp_unpack_value (bp, 1);
 272       DECL_TLS_MODEL (expr) = (enum tls_model) bp_unpack_value (bp,  3);
 273     }
 274
 275   if (TREE_CODE (expr) == FUNCTION_DECL)
 276     {
 277       DECL_FINAL_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 278       DECL_CXX_CONSTRUCTOR_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 279       DECL_CXX_DESTRUCTOR_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 280     }
 281   if (VAR_OR_FUNCTION_DECL_P (expr))
 282     {
 283       priority_type p;
 284       p = (priority_type) bp_unpack_var_len_unsigned (bp);
 285       SET_DECL_INIT_PRIORITY (expr, p);
 286     }
 287 }
 288
 289
 290 /* Unpack all the non-pointer fields of the TS_FUNCTION_DECL structure
 291    of expression EXPR from bitpack BP.  */
 292
 293 static void
 294 unpack_ts_function_decl_value_fields (struct bitpack_d *bp, tree expr)
 295 {
 296   DECL_BUILT_IN_CLASS (expr) = bp_unpack_enum (bp, built_in_class,
 297                                                BUILT_IN_LAST);
 298   DECL_STATIC_CONSTRUCTOR (expr) = (unsigned) bp_unpack_value (bp, 1);
 299   DECL_STATIC_DESTRUCTOR (expr) = (unsigned) bp_unpack_value (bp, 1);
 300   DECL_UNINLINABLE (expr) = (unsigned) bp_unpack_value (bp, 1);
 301   DECL_POSSIBLY_INLINED (expr) = (unsigned) bp_unpack_value (bp, 1);
 302   DECL_IS_NOVOPS (expr) = (unsigned) bp_unpack_value (bp, 1);
 303   DECL_IS_RETURNS_TWICE (expr) = (unsigned) bp_unpack_value (bp, 1);
 304   DECL_IS_MALLOC (expr) = (unsigned) bp_unpack_value (bp, 1);
 305   DECL_IS_OPERATOR_NEW (expr) = (unsigned) bp_unpack_value (bp, 1);
 306   DECL_DECLARED_INLINE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 307   DECL_STATIC_CHAIN (expr) = (unsigned) bp_unpack_value (bp, 1);
 308   DECL_NO_INLINE_WARNING_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 309   DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (expr)
 310                         = (unsigned) bp_unpack_value (bp, 1);
 311   DECL_NO_LIMIT_STACK (expr) = (unsigned) bp_unpack_value (bp, 1);
 312   DECL_DISREGARD_INLINE_LIMITS (expr) = (unsigned) bp_unpack_value (bp, 1);
 313   DECL_PURE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 314   DECL_LOOPING_CONST_OR_PURE_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 315   if (DECL_BUILT_IN_CLASS (expr) != NOT_BUILT_IN)
 316     {
 317       DECL_FUNCTION_CODE (expr) = (enum built_in_function) bp_unpack_value (bp,
 318                                                                             11);
 319       if (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_NORMAL
 320           && DECL_FUNCTION_CODE (expr) >= END_BUILTINS)
 321         fatal_error ("machine independent builtin code out of range");
 322       else if (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_MD)
 323         {
 324           tree result = targetm.builtin_decl (DECL_FUNCTION_CODE (expr), true);
 325           if (!result || result == error_mark_node)
 326             fatal_error ("target specific builtin not available");
 327         }
 328     }
 329   if (DECL_STATIC_DESTRUCTOR (expr))
 330     {
 331       priority_type p;
 332       p = (priority_type) bp_unpack_var_len_unsigned (bp);
 333       SET_DECL_FINI_PRIORITY (expr, p);
 334     }
 335 }
 336
 337
 338 /* Unpack all the non-pointer fields of the TS_TYPE_COMMON structure
 339    of expression EXPR from bitpack BP.  */
 340
 341 static void
 342 unpack_ts_type_common_value_fields (struct bitpack_d *bp, tree expr)
 343 {
 344   enum machine_mode mode;
 345
 346   mode = bp_unpack_enum (bp, machine_mode, MAX_MACHINE_MODE);
 347   SET_TYPE_MODE (expr, mode);
 348   TYPE_STRING_FLAG (expr) = (unsigned) bp_unpack_value (bp, 1);
 349   TYPE_NO_FORCE_BLK (expr) = (unsigned) bp_unpack_value (bp, 1);
 350   TYPE_NEEDS_CONSTRUCTING (expr) = (unsigned) bp_unpack_value (bp, 1);
 351   if (RECORD_OR_UNION_TYPE_P (expr))
 352     {
 353       TYPE_TRANSPARENT_AGGR (expr) = (unsigned) bp_unpack_value (bp, 1);
 354       TYPE_FINAL_P (expr) = (unsigned) bp_unpack_value (bp, 1);
 355     }
 356   else if (TREE_CODE (expr) == ARRAY_TYPE)
 357     TYPE_NONALIASED_COMPONENT (expr) = (unsigned) bp_unpack_value (bp, 1);
 358   TYPE_PACKED (expr) = (unsigned) bp_unpack_value (bp, 1);
 359   TYPE_RESTRICT (expr) = (unsigned) bp_unpack_value (bp, 1);
 360   TYPE_USER_ALIGN (expr) = (unsigned) bp_unpack_value (bp, 1);
 361   TYPE_READONLY (expr) = (unsigned) bp_unpack_value (bp, 1);
 362   TYPE_PRECISION (expr) = bp_unpack_var_len_unsigned (bp);
 363   TYPE_ALIGN (expr) = bp_unpack_var_len_unsigned (bp);
 364   TYPE_ALIAS_SET (expr) = bp_unpack_var_len_int (bp);
 365 }
 366
 367
 368 /* Unpack all the non-pointer fields of the TS_BLOCK structure
 369    of expression EXPR from bitpack BP.  */
 370
 371 static void
 372 unpack_ts_block_value_fields (struct data_in *data_in,
 373                               struct bitpack_d *bp, tree expr)
 374 {
 375   BLOCK_ABSTRACT (expr) = (unsigned) bp_unpack_value (bp, 1);
 376   /* BLOCK_NUMBER is recomputed.  */
 377   BLOCK_SOURCE_LOCATION (expr) = stream_input_location (bp, data_in);
 378 }
 379
 380 /* Unpack all the non-pointer fields of the TS_TRANSLATION_UNIT_DECL
 381    structure of expression EXPR from bitpack BP.  */
 382
 383 static void
 384 unpack_ts_translation_unit_decl_value_fields (struct data_in *data_in,
 385                                               struct bitpack_d *bp, tree expr)
 386 {
 387   TRANSLATION_UNIT_LANGUAGE (expr) = xstrdup (bp_unpack_string (data_in, bp));
 388   vec_safe_push (all_translation_units, expr);
 389 }
 390
 391 /* Unpack a TS_TARGET_OPTION tree from BP into EXPR.  */
 392
 393 static void
 394 unpack_ts_target_option (struct bitpack_d *bp, tree expr)
 395 {
 396   unsigned i, len;
 397   struct cl_target_option *t = TREE_TARGET_OPTION (expr);
 398
 399   len = sizeof (struct cl_target_option);
 400   for (i = 0; i < len; i++)
 401     ((unsigned char *)t)[i] = bp_unpack_value (bp, 8);
 402   if (bp_unpack_value (bp, 32) != 0x12345678)
 403     fatal_error ("cl_target_option size mismatch in LTO reader and writer");
 404 }
 405
 406 /* Unpack a TS_OPTIMIZATION tree from BP into EXPR.  */
 407
 408 static void
 409 unpack_ts_optimization (struct bitpack_d *bp, tree expr)
 410 {
 411   unsigned i, len;
 412   struct cl_optimization *t = TREE_OPTIMIZATION (expr);
 413
 414   len = sizeof (struct cl_optimization);
 415   for (i = 0; i < len; i++)
 416     ((unsigned char *)t)[i] = bp_unpack_value (bp, 8);
 417   if (bp_unpack_value (bp, 32) != 0x12345678)
 418     fatal_error ("cl_optimization size mismatch in LTO reader and writer");
 419 }
 420
 421
 422 /* Unpack all the non-pointer fields in EXPR into a bit pack.  */
 423
 424 static void
 425 unpack_value_fields (struct data_in *data_in, struct bitpack_d *bp, tree expr)
 426 {
 427   enum tree_code code;
 428
 429   code = TREE_CODE (expr);
 430
 431   /* Note that all these functions are highly sensitive to changes in
 432      the types and sizes of each of the fields being packed.  */
 433   unpack_ts_base_value_fields (bp, expr);
 434
 435   if (CODE_CONTAINS_STRUCT (code, TS_INT_CST))
 436     unpack_ts_int_cst_value_fields (bp, expr);
 437
 438   if (CODE_CONTAINS_STRUCT (code, TS_REAL_CST))
 439     unpack_ts_real_cst_value_fields (bp, expr);
 440
 441   if (CODE_CONTAINS_STRUCT (code, TS_FIXED_CST))
 442     unpack_ts_fixed_cst_value_fields (bp, expr);
 443
 444   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 445     DECL_SOURCE_LOCATION (expr) = stream_input_location (bp, data_in);
 446
 447   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 448     unpack_ts_decl_common_value_fields (bp, expr);
 449
 450   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WRTL))
 451     unpack_ts_decl_wrtl_value_fields (bp, expr);
 452
 453   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 454     unpack_ts_decl_with_vis_value_fields (bp, expr);
 455
 456   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 457     unpack_ts_function_decl_value_fields (bp, expr);
 458
 459   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 460     unpack_ts_type_common_value_fields (bp, expr);
 461
 462   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
 463     SET_EXPR_LOCATION (expr, stream_input_location (bp, data_in));
 464
 465   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
 466     unpack_ts_block_value_fields (data_in, bp, expr);
 467
 468   if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL))
 469     unpack_ts_translation_unit_decl_value_fields (data_in, bp, expr);
 470
 471   if (CODE_CONTAINS_STRUCT (code, TS_TARGET_OPTION))
 472     unpack_ts_target_option (bp, expr);
 473
 474   if (CODE_CONTAINS_STRUCT (code, TS_OPTIMIZATION))
 475     unpack_ts_optimization (bp, expr);
 476
 477   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 478     {
 479       unsigned HOST_WIDE_INT length = bp_unpack_var_len_unsigned (bp);
 480       if (length > 0)
 481         vec_safe_grow (BINFO_BASE_ACCESSES (expr), length);
 482     }
 483
 484   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
 485     {
 486       unsigned HOST_WIDE_INT length = bp_unpack_var_len_unsigned (bp);
 487       if (length > 0)
 488         vec_safe_grow (CONSTRUCTOR_ELTS (expr), length);
 489     }
 490 }
 491
 492
 493 /* Read all the language-independent bitfield values for EXPR from IB.
 494    Return the partially unpacked bitpack so the caller can unpack any other
 495    bitfield values that the writer may have written.  */
 496
 497 struct bitpack_d
 498 streamer_read_tree_bitfields (struct lto_input_block *ib,
 499                               struct data_in *data_in, tree expr)
 500 {
 501   enum tree_code code;
 502   struct bitpack_d bp;
 503
 504   /* Read the bitpack of non-pointer values from IB.  */
 505   bp = streamer_read_bitpack (ib);
 506
 507   /* The first word in BP contains the code of the tree that we
 508      are about to read.  */
 509   code = (enum tree_code) bp_unpack_value (&bp, 16);
 510   lto_tag_check (lto_tree_code_to_tag (code),
 511                  lto_tree_code_to_tag (TREE_CODE (expr)));
 512
 513   /* Unpack all the value fields from BP.  */
 514   unpack_value_fields (data_in, &bp, expr);
 515
 516   return bp;
 517 }
 518
 519
 520 /* Materialize a new tree from input block IB using descriptors in
 521    DATA_IN.  The code for the new tree should match TAG.  Store in
 522    *IX_P the index into the reader cache where the new tree is stored.  */
 523
 524 tree
 525 streamer_alloc_tree (struct lto_input_block *ib, struct data_in *data_in,
 526                      enum LTO_tags tag)
 527 {
 528   enum tree_code code;
 529   tree result;
 530 #ifdef LTO_STREAMER_DEBUG
 531   HOST_WIDEST_INT orig_address_in_writer;
 532 #endif
 533
 534   result = NULL_TREE;
 535
 536 #ifdef LTO_STREAMER_DEBUG
 537   /* Read the word representing the memory address for the tree
 538      as it was written by the writer.  This is useful when
 539      debugging differences between the writer and reader.  */
 540   orig_address_in_writer = streamer_read_hwi (ib);
 541   gcc_assert ((intptr_t) orig_address_in_writer == orig_address_in_writer);
 542 #endif
 543
 544   code = lto_tag_to_tree_code (tag);
 545
 546   /* We should never see an SSA_NAME tree.  Only the version numbers of
 547      SSA names are ever written out.  See input_ssa_names.  */
 548   gcc_assert (code != SSA_NAME);
 549
 550   /* Instantiate a new tree using the header data.  */
 551   if (CODE_CONTAINS_STRUCT (code, TS_STRING))
 552     result = streamer_read_string_cst (data_in, ib);
 553   else if (CODE_CONTAINS_STRUCT (code, TS_IDENTIFIER))
 554     result = input_identifier (data_in, ib);
 555   else if (CODE_CONTAINS_STRUCT (code, TS_VEC))
 556     {
 557       HOST_WIDE_INT len = streamer_read_hwi (ib);
 558       result = make_tree_vec (len);
 559     }
 560   else if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 561     {
 562       HOST_WIDE_INT len = streamer_read_hwi (ib);
 563       result = make_vector (len);
 564     }
 565   else if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
 566     {
 567       unsigned HOST_WIDE_INT len = streamer_read_uhwi (ib);
 568       result = make_tree_binfo (len);
 569     }
 570   else if (code == CALL_EXPR)
 571     {
 572       unsigned HOST_WIDE_INT nargs = streamer_read_uhwi (ib);
 573       return build_vl_exp (CALL_EXPR, nargs + 3);
 574     }
 575   else
 576     {
 577       /* For all other nodes, materialize the tree with a raw
 578          make_node call.  */
 579       result = make_node (code);
 580     }
 581
 582 #ifdef LTO_STREAMER_DEBUG
 583   /* Store the original address of the tree as seen by the writer
 584      in RESULT's aux field.  This is useful when debugging streaming
 585      problems.  This way, a debugging session can be started on
 586      both writer and reader with a breakpoint using this address
 587      value in both.  */
 588   lto_orig_address_map (result, (intptr_t) orig_address_in_writer);
 589 #endif
 590
 591   return result;
 592 }
 593
 594
 595 /* Read all pointer fields in the TS_COMMON structure of EXPR from input
 596    block IB.  DATA_IN contains tables and descriptors for the
 597    file being read.  */
 598
 599
 600 static void
 601 lto_input_ts_common_tree_pointers (struct lto_input_block *ib,
 602                                    struct data_in *data_in, tree expr)
 603 {
 604   if (TREE_CODE (expr) != IDENTIFIER_NODE)
 605     TREE_TYPE (expr) = stream_read_tree (ib, data_in);
 606 }
 607
 608
 609 /* Read all pointer fields in the TS_VECTOR structure of EXPR from input
 610    block IB.  DATA_IN contains tables and descriptors for the
 611    file being read.  */
 612
 613 static void
 614 lto_input_ts_vector_tree_pointers (struct lto_input_block *ib,
 615                                    struct data_in *data_in, tree expr)
 616 {
 617   unsigned i;
 618   for (i = 0; i < VECTOR_CST_NELTS (expr); ++i)
 619     VECTOR_CST_ELT (expr, i) = stream_read_tree (ib, data_in);
 620 }
 621
 622
 623 /* Read all pointer fields in the TS_COMPLEX structure of EXPR from input
 624    block IB.  DATA_IN contains tables and descriptors for the
 625    file being read.  */
 626
 627 static void
 628 lto_input_ts_complex_tree_pointers (struct lto_input_block *ib,
 629                                     struct data_in *data_in, tree expr)
 630 {
 631   TREE_REALPART (expr) = stream_read_tree (ib, data_in);
 632   TREE_IMAGPART (expr) = stream_read_tree (ib, data_in);
 633 }
 634
 635
 636 /* Read all pointer fields in the TS_DECL_MINIMAL structure of EXPR
 637    from input block IB.  DATA_IN contains tables and descriptors for the
 638    file being read.  */
 639
 640 static void
 641 lto_input_ts_decl_minimal_tree_pointers (struct lto_input_block *ib,
 642                                          struct data_in *data_in, tree expr)
 643 {
 644   DECL_NAME (expr) = stream_read_tree (ib, data_in);
 645   DECL_CONTEXT (expr) = stream_read_tree (ib, data_in);
 646 }
 647
 648
 649 /* Read all pointer fields in the TS_DECL_COMMON structure of EXPR from
 650    input block IB.  DATA_IN contains tables and descriptors for the
 651    file being read.  */
 652
 653 static void
 654 lto_input_ts_decl_common_tree_pointers (struct lto_input_block *ib,
 655                                         struct data_in *data_in, tree expr)
 656 {
 657   DECL_SIZE (expr) = stream_read_tree (ib, data_in);
 658   DECL_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 659   DECL_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 660
 661   /* Do not stream DECL_ABSTRACT_ORIGIN.  We cannot handle debug information
 662      for early inlining so drop it on the floor instead of ICEing in
 663      dwarf2out.c.  */
 664
 665   if ((TREE_CODE (expr) == VAR_DECL
 666        || TREE_CODE (expr) == PARM_DECL)
 667       && DECL_HAS_VALUE_EXPR_P (expr))
 668     SET_DECL_VALUE_EXPR (expr, stream_read_tree (ib, data_in));
 669
 670   if (TREE_CODE (expr) == VAR_DECL)
 671     {
 672       tree dexpr = stream_read_tree (ib, data_in);
 673       if (dexpr)
 674         SET_DECL_DEBUG_EXPR (expr, dexpr);
 675     }
 676 }
 677
 678
 679 /* Read all pointer fields in the TS_DECL_NON_COMMON structure of
 680    EXPR from input block IB.  DATA_IN contains tables and descriptors for the
 681    file being read.  */
 682
 683 static void
 684 lto_input_ts_decl_non_common_tree_pointers (struct lto_input_block *ib,
 685                                             struct data_in *data_in, tree expr)
 686 {
 687   if (TREE_CODE (expr) == TYPE_DECL)
 688     DECL_ORIGINAL_TYPE (expr) = stream_read_tree (ib, data_in);
 689   DECL_VINDEX (expr) = stream_read_tree (ib, data_in);
 690 }
 691
 692
 693 /* Read all pointer fields in the TS_DECL_WITH_VIS structure of EXPR
 694    from input block IB.  DATA_IN contains tables and descriptors for the
 695    file being read.  */
 696
 697 static void
 698 lto_input_ts_decl_with_vis_tree_pointers (struct lto_input_block *ib,
 699                                           struct data_in *data_in, tree expr)
 700 {
 701   tree id;
 702
 703   id = stream_read_tree (ib, data_in);
 704   if (id)
 705     {
 706       gcc_assert (TREE_CODE (id) == IDENTIFIER_NODE);
 707       SET_DECL_ASSEMBLER_NAME (expr, id);
 708     }
 709
 710   DECL_SECTION_NAME (expr) = stream_read_tree (ib, data_in);
 711   DECL_COMDAT_GROUP (expr) = stream_read_tree (ib, data_in);
 712 }
 713
 714
 715 /* Read all pointer fields in the TS_FIELD_DECL structure of EXPR from
 716    input block IB.  DATA_IN contains tables and descriptors for the
 717    file being read.  */
 718
 719 static void
 720 lto_input_ts_field_decl_tree_pointers (struct lto_input_block *ib,
 721                                        struct data_in *data_in, tree expr)
 722 {
 723   DECL_FIELD_OFFSET (expr) = stream_read_tree (ib, data_in);
 724   DECL_BIT_FIELD_TYPE (expr) = stream_read_tree (ib, data_in);
 725   DECL_BIT_FIELD_REPRESENTATIVE (expr) = stream_read_tree (ib, data_in);
 726   DECL_FIELD_BIT_OFFSET (expr) = stream_read_tree (ib, data_in);
 727   DECL_FCONTEXT (expr) = stream_read_tree (ib, data_in);
 728 }
 729
 730
 731 /* Read all pointer fields in the TS_FUNCTION_DECL structure of EXPR
 732    from input block IB.  DATA_IN contains tables and descriptors for the
 733    file being read.  */
 734
 735 static void
 736 lto_input_ts_function_decl_tree_pointers (struct lto_input_block *ib,
 737                                           struct data_in *data_in, tree expr)
 738 {
 739   /* DECL_STRUCT_FUNCTION is handled by lto_input_function.  FIXME lto,
 740      maybe it should be handled here?  */
 741   DECL_FUNCTION_PERSONALITY (expr) = stream_read_tree (ib, data_in);
 742   DECL_FUNCTION_SPECIFIC_TARGET (expr) = stream_read_tree (ib, data_in);
 743   DECL_FUNCTION_SPECIFIC_OPTIMIZATION (expr) = stream_read_tree (ib, data_in);
 744
 745   /* If the file contains a function with an EH personality set,
 746      then it was compiled with -fexceptions.  In that case, initialize
 747      the backend EH machinery.  */
 748   if (DECL_FUNCTION_PERSONALITY (expr))
 749     lto_init_eh ();
 750 }
 751
 752
 753 /* Read all pointer fields in the TS_TYPE_COMMON structure of EXPR from
 754    input block IB.  DATA_IN contains tables and descriptors for the file
 755    being read.  */
 756
 757 static void
 758 lto_input_ts_type_common_tree_pointers (struct lto_input_block *ib,
 759                                         struct data_in *data_in, tree expr)
 760 {
 761   TYPE_SIZE (expr) = stream_read_tree (ib, data_in);
 762   TYPE_SIZE_UNIT (expr) = stream_read_tree (ib, data_in);
 763   TYPE_ATTRIBUTES (expr) = stream_read_tree (ib, data_in);
 764   TYPE_NAME (expr) = stream_read_tree (ib, data_in);
 765   /* Do not stream TYPE_POINTER_TO or TYPE_REFERENCE_TO.  They will be
 766      reconstructed during fixup.  */
 767   /* Do not stream TYPE_NEXT_VARIANT, we reconstruct the variant lists
 768      during fixup.  */
 769   TYPE_MAIN_VARIANT (expr) = stream_read_tree (ib, data_in);
 770   TYPE_CONTEXT (expr) = stream_read_tree (ib, data_in);
 771   /* TYPE_CANONICAL gets re-computed during type merging.  */
 772   TYPE_CANONICAL (expr) = NULL_TREE;
 773   TYPE_STUB_DECL (expr) = stream_read_tree (ib, data_in);
 774 }
 775
 776 /* Read all pointer fields in the TS_TYPE_NON_COMMON structure of EXPR
 777    from input block IB.  DATA_IN contains tables and descriptors for the
 778    file being read.  */
 779
 780 static void
 781 lto_input_ts_type_non_common_tree_pointers (struct lto_input_block *ib,
 782                                             struct data_in *data_in,
 783                                             tree expr)
 784 {
 785   if (TREE_CODE (expr) == ENUMERAL_TYPE)
 786     TYPE_VALUES (expr) = stream_read_tree (ib, data_in);
 787   else if (TREE_CODE (expr) == ARRAY_TYPE)
 788     TYPE_DOMAIN (expr) = stream_read_tree (ib, data_in);
 789   else if (RECORD_OR_UNION_TYPE_P (expr))
 790     TYPE_FIELDS (expr) = streamer_read_chain (ib, data_in);
 791   else if (TREE_CODE (expr) == FUNCTION_TYPE
 792            || TREE_CODE (expr) == METHOD_TYPE)
 793     TYPE_ARG_TYPES (expr) = stream_read_tree (ib, data_in);
 794
 795   if (!POINTER_TYPE_P (expr))
 796     TYPE_MINVAL (expr) = stream_read_tree (ib, data_in);
 797   TYPE_MAXVAL (expr) = stream_read_tree (ib, data_in);
 798   if (RECORD_OR_UNION_TYPE_P (expr))
 799     TYPE_BINFO (expr) = stream_read_tree (ib, data_in);
 800 }
 801
 802
 803 /* Read all pointer fields in the TS_LIST structure of EXPR from input
 804    block IB.  DATA_IN contains tables and descriptors for the
 805    file being read.  */
 806
 807 static void
 808 lto_input_ts_list_tree_pointers (struct lto_input_block *ib,
 809                                  struct data_in *data_in, tree expr)
 810 {
 811   TREE_PURPOSE (expr) = stream_read_tree (ib, data_in);
 812   TREE_VALUE (expr) = stream_read_tree (ib, data_in);
 813   TREE_CHAIN (expr) = stream_read_tree (ib, data_in);
 814 }
 815
 816
 817 /* Read all pointer fields in the TS_VEC structure of EXPR from input
 818    block IB.  DATA_IN contains tables and descriptors for the
 819    file being read.  */
 820
 821 static void
 822 lto_input_ts_vec_tree_pointers (struct lto_input_block *ib,
 823                                 struct data_in *data_in, tree expr)
 824 {
 825   int i;
 826
 827   /* Note that TREE_VEC_LENGTH was read by streamer_alloc_tree to
 828      instantiate EXPR.  */
 829   for (i = 0; i < TREE_VEC_LENGTH (expr); i++)
 830     TREE_VEC_ELT (expr, i) = stream_read_tree (ib, data_in);
 831 }
 832
 833
 834 /* Read all pointer fields in the TS_EXP structure of EXPR from input
 835    block IB.  DATA_IN contains tables and descriptors for the
 836    file being read.  */
 837
 838
 839 static void
 840 lto_input_ts_exp_tree_pointers (struct lto_input_block *ib,
 841                                 struct data_in *data_in, tree expr)
 842 {
 843   int i;
 844
 845   for (i = 0; i < TREE_OPERAND_LENGTH (expr); i++)
 846     TREE_OPERAND (expr, i) = stream_read_tree (ib, data_in);
 847
 848   TREE_SET_BLOCK (expr, stream_read_tree (ib, data_in));
 849 }
 850
 851
 852 /* Read all pointer fields in the TS_BLOCK structure of EXPR from input
 853    block IB.  DATA_IN contains tables and descriptors for the
 854    file being read.  */
 855
 856 static void
 857 lto_input_ts_block_tree_pointers (struct lto_input_block *ib,
 858                                   struct data_in *data_in, tree expr)
 859 {
 860   BLOCK_VARS (expr) = streamer_read_chain (ib, data_in);
 861
 862   BLOCK_SUPERCONTEXT (expr) = stream_read_tree (ib, data_in);
 863
 864   /* Stream BLOCK_ABSTRACT_ORIGIN and BLOCK_SOURCE_LOCATION for
 865      the limited cases we can handle - those that represent inlined
 866      function scopes.  For the rest them on the floor instead of ICEing in
 867      dwarf2out.c.  */
 868   BLOCK_ABSTRACT_ORIGIN (expr) = stream_read_tree (ib, data_in);
 869   /* Do not stream BLOCK_NONLOCALIZED_VARS.  We cannot handle debug information
 870      for early inlined BLOCKs so drop it on the floor instead of ICEing in
 871      dwarf2out.c.  */
 872
 873   /* BLOCK_FRAGMENT_ORIGIN and BLOCK_FRAGMENT_CHAIN is not live at LTO
 874      streaming time.  */
 875
 876   /* We re-compute BLOCK_SUBBLOCKS of our parent here instead
 877      of streaming it.  For non-BLOCK BLOCK_SUPERCONTEXTs we still
 878      stream the child relationship explicitly.  */
 879   if (BLOCK_SUPERCONTEXT (expr)
 880       && TREE_CODE (BLOCK_SUPERCONTEXT (expr)) == BLOCK)
 881     {
 882       BLOCK_CHAIN (expr) = BLOCK_SUBBLOCKS (BLOCK_SUPERCONTEXT (expr));
 883       BLOCK_SUBBLOCKS (BLOCK_SUPERCONTEXT (expr)) = expr;
 884     }
 885
 886   /* The global block is rooted at the TU decl.  Hook it here to
 887      avoid the need to stream in this block during WPA time.  */
 888   else if (BLOCK_SUPERCONTEXT (expr)
 889            && TREE_CODE (BLOCK_SUPERCONTEXT (expr)) == TRANSLATION_UNIT_DECL)
 890     DECL_INITIAL (BLOCK_SUPERCONTEXT (expr)) = expr;
 891
 892   /* The function-level block is connected at the time we read in
 893      function bodies for the same reason.  */
 894 }
 895
 896
 897 /* Read all pointer fields in the TS_BINFO structure of EXPR from input
 898    block IB.  DATA_IN contains tables and descriptors for the
 899    file being read.  */
 900
 901 static void
 902 lto_input_ts_binfo_tree_pointers (struct lto_input_block *ib,
 903                                   struct data_in *data_in, tree expr)
 904 {
 905   unsigned i;
 906   tree t;
 907
 908   /* Note that the number of slots in EXPR was read in
 909      streamer_alloc_tree when instantiating EXPR.  However, the
 910      vector is empty so we cannot rely on vec::length to know how many
 911      elements to read.  So, this list is emitted as a 0-terminated
 912      list on the writer side.  */
 913   do
 914     {
 915       t = stream_read_tree (ib, data_in);
 916       if (t)
 917         BINFO_BASE_BINFOS (expr)->quick_push (t);
 918     }
 919   while (t);
 920
 921   BINFO_OFFSET (expr) = stream_read_tree (ib, data_in);
 922   BINFO_VTABLE (expr) = stream_read_tree (ib, data_in);
 923   BINFO_VPTR_FIELD (expr) = stream_read_tree (ib, data_in);
 924
 925   /* The vector of BINFO_BASE_ACCESSES is pre-allocated during
 926      unpacking the bitfield section.  */
 927   for (i = 0; i < vec_safe_length (BINFO_BASE_ACCESSES (expr)); i++)
 928     {
 929       tree a = stream_read_tree (ib, data_in);
 930       (*BINFO_BASE_ACCESSES (expr))[i] = a;
 931     }
 932   /* Do not walk BINFO_INHERITANCE_CHAIN, BINFO_SUBVTT_INDEX
 933      and BINFO_VPTR_INDEX; these are used by C++ FE only.  */
 934 }
 935
 936
 937 /* Read all pointer fields in the TS_CONSTRUCTOR structure of EXPR from
 938    input block IB.  DATA_IN contains tables and descriptors for the
 939    file being read.  */
 940
 941 static void
 942 lto_input_ts_constructor_tree_pointers (struct lto_input_block *ib,
 943                                         struct data_in *data_in, tree expr)
 944 {
 945   unsigned i;
 946
 947   for (i = 0; i < CONSTRUCTOR_NELTS (expr); i++)
 948     {
 949       constructor_elt e;
 950       e.index = stream_read_tree (ib, data_in);
 951       e.value = stream_read_tree (ib, data_in);
 952       (*CONSTRUCTOR_ELTS (expr))[i] = e;
 953     }
 954 }
 955
 956
 957 /* Read all pointer fields in EXPR from input block IB.  DATA_IN
 958    contains tables and descriptors for the file being read.  */
 959
 960 void
 961 streamer_read_tree_body (struct lto_input_block *ib, struct data_in *data_in,
 962                          tree expr)
 963 {
 964   enum tree_code code;
 965
 966   code = TREE_CODE (expr);
 967
 968   if (CODE_CONTAINS_STRUCT (code, TS_TYPED))
 969     lto_input_ts_common_tree_pointers (ib, data_in, expr);
 970
 971   if (CODE_CONTAINS_STRUCT (code, TS_VECTOR))
 972     lto_input_ts_vector_tree_pointers (ib, data_in, expr);
 973
 974   if (CODE_CONTAINS_STRUCT (code, TS_COMPLEX))
 975     lto_input_ts_complex_tree_pointers (ib, data_in, expr);
 976
 977   if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL))
 978     lto_input_ts_decl_minimal_tree_pointers (ib, data_in, expr);
 979
 980   if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON))
 981     lto_input_ts_decl_common_tree_pointers (ib, data_in, expr);
 982
 983   if (CODE_CONTAINS_STRUCT (code, TS_DECL_NON_COMMON))
 984     lto_input_ts_decl_non_common_tree_pointers (ib, data_in, expr);
 985
 986   if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS))
 987     lto_input_ts_decl_with_vis_tree_pointers (ib, data_in, expr);
 988
 989   if (CODE_CONTAINS_STRUCT (code, TS_FIELD_DECL))
 990     lto_input_ts_field_decl_tree_pointers (ib, data_in, expr);
 991
 992   if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL))
 993     lto_input_ts_function_decl_tree_pointers (ib, data_in, expr);
 994
 995   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON))
 996     lto_input_ts_type_common_tree_pointers (ib, data_in, expr);
 997
 998   if (CODE_CONTAINS_STRUCT (code, TS_TYPE_NON_COMMON))
 999     lto_input_ts_type_non_common_tree_pointers (ib, data_in, expr);
1000
1001   if (CODE_CONTAINS_STRUCT (code, TS_LIST))
1002     lto_input_ts_list_tree_pointers (ib, data_in, expr);
1003
1004   if (CODE_CONTAINS_STRUCT (code, TS_VEC))
1005     lto_input_ts_vec_tree_pointers (ib, data_in, expr);
1006
1007   if (CODE_CONTAINS_STRUCT (code, TS_EXP))
1008     lto_input_ts_exp_tree_pointers (ib, data_in, expr);
1009
1010   if (CODE_CONTAINS_STRUCT (code, TS_BLOCK))
1011     lto_input_ts_block_tree_pointers (ib, data_in, expr);
1012
1013   if (CODE_CONTAINS_STRUCT (code, TS_BINFO))
1014     lto_input_ts_binfo_tree_pointers (ib, data_in, expr);
1015
1016   if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR))
1017     lto_input_ts_constructor_tree_pointers (ib, data_in, expr);
1018 }
1019
1020
1021 /* Read an index IX from input block IB and return the tree node at
1022    DATA_IN->FILE_DATA->GLOBALS_INDEX[IX].  */
1023
1024 tree
1025 streamer_get_pickled_tree (struct lto_input_block *ib, struct data_in *data_in)
1026 {
1027   unsigned HOST_WIDE_INT ix;
1028   tree result;
1029   enum LTO_tags expected_tag;
1030
1031   ix = streamer_read_uhwi (ib);
1032   expected_tag = streamer_read_enum (ib, LTO_tags, LTO_NUM_TAGS);
1033
1034   result = streamer_tree_cache_get_tree (data_in->reader_cache, ix);
1035   gcc_assert (result
1036               && TREE_CODE (result) == lto_tag_to_tree_code (expected_tag));
1037
1038   return result;
1039 }
1040
1041
1042 /* Read a code and class from input block IB and return the
1043    corresponding builtin.  DATA_IN is as in stream_read_tree.  */
1044
1045 tree
1046 streamer_get_builtin_tree (struct lto_input_block *ib, struct data_in *data_in)
1047 {
1048   enum built_in_class fclass;
1049   enum built_in_function fcode;
1050   const char *asmname;
1051   tree result;
1052
1053   fclass = streamer_read_enum (ib, built_in_class, BUILT_IN_LAST);
1054   gcc_assert (fclass == BUILT_IN_NORMAL || fclass == BUILT_IN_MD);
1055
1056   fcode = (enum built_in_function) streamer_read_uhwi (ib);
1057
1058   if (fclass == BUILT_IN_NORMAL)
1059     {
1060       if (fcode >= END_BUILTINS)
1061         fatal_error ("machine independent builtin code out of range");
1062       result = builtin_decl_explicit (fcode);
1063       gcc_assert (result);
1064     }
1065   else if (fclass == BUILT_IN_MD)
1066     {
1067       result = targetm.builtin_decl (fcode, true);
1068       if (!result || result == error_mark_node)
1069         fatal_error ("target specific builtin not available");
1070     }
1071   else
1072     gcc_unreachable ();
1073
1074   asmname = streamer_read_string (data_in, ib);
1075   if (asmname)
1076     set_builtin_user_assembler_name (result, asmname);
1077
1078   streamer_tree_cache_append (data_in->reader_cache, result, 0);
1079
1080   return result;
1081 }